From 6e0e70b1caf42a19adf27dbf3b0bda34c4636dc3 Mon Sep 17 00:00:00 2001
From: Michael <42828375+sarmong@users.noreply.github.com>
Date: Sun, 10 Apr 2022 18:23:37 +0300
Subject: [PATCH] feat: delete preview buffers #1145 (#1149)

---
 lua/nvim-tree/actions/open-file.lua | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lua/nvim-tree/actions/open-file.lua b/lua/nvim-tree/actions/open-file.lua
index 84a73e9a..dcc21a92 100644
--- a/lua/nvim-tree/actions/open-file.lua
+++ b/lua/nvim-tree/actions/open-file.lua
@@ -194,6 +194,15 @@ function M.fn(mode, filename)
   local do_split = mode == "split" or mode == "vsplit"
   local vertical = mode ~= "split"
 
+  -- Check if file is already loaded in a buffer
+  local buf_loaded = false
+  for _, buf_id in ipairs(api.nvim_list_bufs()) do
+    if api.nvim_buf_is_loaded(buf_id) and filename == api.nvim_buf_get_name(buf_id) then
+      buf_loaded = true
+      break
+    end
+  end
+
   -- Check if filename is already open in a window
   local found = false
   for _, id in ipairs(win_ids) do
@@ -245,6 +254,16 @@ function M.fn(mode, filename)
   end
 
   if mode == "preview" then
+    if not buf_loaded then
+      vim.bo.bufhidden = "delete"
+      vim.cmd [[
+      augroup RemoveBufHidden
+          autocmd!
+          autocmd TextChanged <buffer> setlocal bufhidden= | autocmd! RemoveBufHidden
+          autocmd TextChangedI <buffer> setlocal bufhidden= | autocmd! RemoveBufHidden
+      augroup end
+    ]]
+    end
     view.focus()
     return
   end